Size Clearance Hole mm Tapping Drill (std Pitch)
---- ----------------- -------------------------
M5 5.5 4.2 mm
M6 6.5 5.0 mm
M8 9 6.75 mm
M10 11 8.5 mm
Are M8 bolts 8mm wide?
But, to answer your Q - an M8 bolt will fit in an 8mm hole. There is clearance.Dec 23, 2014
Is 5/16 The same as M8?
Well, quick answer is no. They are not the same and they are not interchangeable, although they can work under certain circumstances. The most important part is understanding the meaning of M8 and 5/16 to refer to the size of a metric screw or bolt, so then we can see why they aren't the same thing!
The length of a metric bolt is measured and defined in exactly the same way as imperial, inch-based bolts and fasteners. Socket head, pan head, button head and hex head bolts are measured from the underside of the bolt head to the end of the shaft.Jun 19, 2020